Replacing battery in Blue lab P.H meter/ Doing Slurries Again with Dutchman420

wanna know exactly how much your plants are actually eating? lets see how to slurry test... once you know how much they eat then you will see when they are hungry,or if they are loaded with ppms in soil...and show deficiencies ..then you know your locked out...also you can bump up nutes gradually and find their sweet spot to dial em in like its fukin' space 1999 digital...not analog...lol...